symfony

This PR was squashed before being merged into the 2.7 branch (closes #25599).

Discussion
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Add application/ld+json format associated to json

| Q             | A
| ------------- | ---
| Branch?       | 2.7 up to 4.0
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Add `application/ld+json` Content-Type as json format in Request.

Commits
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0917c4c2 Add application/ld+json format associated to json